<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <input type="checkbox" name="angle" class="fly" value="2">sky
    <input type="checkbox" name="angle" class="fly" value="1">moon


    <input type="checkbox" name="angle" class="fly1" value="11">moon
    <script src="../jquery.min.js"></script>
    <script>
        // 【标记】可以回填
        $(".fly").attr("disabled", "disabled");
        $(".fly").each(function(i, v) {
            if ($(v).val() == 1) {
                $(v).prop('checked', true);
            }
        })
        console.log($(".sky").val()); //
    </script>
</body>

</html>